Latest or all posts or last 15, 30, 90 or 180 days.
Upgrade the memory of your 2020 iMac up to 128GB
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$2798 $2198
SAVE $600

$348 $278
SAVE $70

$389 $299
SAVE $90

$2098 $1298
SAVE $800

$1499 $1129
SAVE $370

$322 $242
SAVE $80

$1499 $1129
SAVE $370

$330 $330
SAVE $click

$498 $398
SAVE $100

$180 $140
SAVE $40

$500 $275
SAVE $225

$180 $136
SAVE $44

$130 $100
SAVE $30

$2997 $2497
SAVE $500

$3498 $2998
SAVE $500

$370 $370
SAVE $click

$4899 $4499
SAVE $400

$1000 $1000
SAVE $click

$1699 $1149
SAVE $550

$280 $230
SAVE $50

$1899 $1499
SAVE $400

$4499 $3499
SAVE $1000

$2198 $1998
SAVE $200

$3998 $3498
SAVE $500

$1799 $1699
SAVE $100

$18599 $16599
SAVE $2000

$1149 $1149
SAVE $click

$650 $450
SAVE $200

$199 $119
SAVE $80

$280 $200
SAVE $80

$1399 $1049
SAVE $350

$1199 $779
SAVE $420

$250 $200
SAVE $50

$1699 $1149
SAVE $550

$200 $130
SAVE $70

$79 $49
SAVE $30

$120 $30
SAVE $90

$189 $159
SAVE $30

$3699 $1299
SAVE $2400

$3899 $1499
SAVE $2400

$2999 $1999
SAVE $1000

$1699 $849
SAVE $850

$1698 $1198
SAVE $500

$1149 $1149
SAVE $click

$1399 $1049
SAVE $350

$1498 $998
SAVE $500

$2797 $2497
SAVE $300

$280 $230
SAVE $50

$700 $500
SAVE $200

$899 $549
SAVE $350

$1699 $1149
SAVE $550

B&H Photo Cyber Monday Deals

Photo, video, television, far more!.
OWC Cyber Monday Deals

Upgrades, sound, iPad/iPhone, computing, storage, more!

Sony A7R II with Leica M Lenses

Sony A7R II

Get Sony A7R II at B&H Photo.

The basic problem with image quality with rangefinder lenses on all Sony mirrorless cameras is the use of relatively thick sensor cover glass. Rays from the lens must pass through this glass, and in so doing a severe astigmatism is created (very strong smearing) along with chromatic aberrations, caused by a displacement in focus of the sagittal and tangential rays. There can be other issues, including various flares.

The internet is abuzz with claims from those who think that the laws of optics have been repealed for the Sony A7R II, just because it has a new sensor.

These claims seem to be based on seeing less color shading, but this has always varied by sensor (magenta with some Sony sensors, green with others). Better neutrality is good, but it’s silly to think this means a whole lot. Sony cannot change the thickness of the sensor cover glass without altering the optical path, and this would degrade image quality with lenses designed for it (and in ways that test benches won’t necessarily show, such as color aberrations, bokeh and flares). So the A7R II has the same sensor cover glass thickness as all its siblings. Hence its imaging performance with steep ray angle lenses (e.g., Leica M, Zeiss ZM, etc) is not going to change vs previous Sony mirrorless models.

Well, I always believe in checking even if it is logically impossible, so I did, using the Leica 28mm f/2.8 Elmarit-M ASPH. The sharpness losses outside a small central area are severe, just as expected, very badly blurred/smeared over most of the frame.

In about two weeks, I should have a KolariVision-modified Sony A7R II which I will pit against my unmodified A7R II. That will show the massive quality loss that occurs in the unmodified camera.

Example

It’s amazing to me that anyone can look at results like this and claim that Leica M lenses work great on any Sony body (unmodified). Even the 50/2 APO needs f/5.6 to overcome the losses from the sensor cover glass! See the links below—yes you can get decent (but not optimal) results by stopping down to f/11 with Leica wide angles. And you can get vastly superior results wide open with native lenses costing far less.

Image below is at 50% of actual pixels, so it is even worse than it looks. It is IN FOCUS and at peak performance! Severe astigmatism as well as lateral chromatic aberration are caused by wave-plate displacement of sagittal and tangential rays. The new Sony A7R II sensor is hugely better for color shading, but no sensor can undo the damage done by the sensor cover glass. View a larger-width crop.

f2.8 @ 1/640 sec, ISO 100; 2015-08-08 15:08:55
Sony A7R II + Leica 28mm f/2.8 Elmarit-M ASPH

[low-res image for bot]

M lenses evaluated

The prior Leica M lens evaluations with the Kolarivision-modified Sony A7R can be found in Guide to Leica, comparing a modified to unmodified Sony A7R:

Holiday Deals on Camera Gear


Sony, Nikon, Canon, Fujifilm, more!
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!
OWC Envoy Express

World’s first Thunderbolt 3 M.2 NVME SSD enclosure.

Super fast, bus-powered, 3.3 oz, DIY easy, rugged and compact!


See also OWC Express 4M2
√ No more slow and noisy hard drives!
OWC Envoy Pro EX SSD
Blazingly fast Thunderbolt 3 SSD!

Up to 4TB capacity, USB-C compatible.

USB-C model also available


Great for travel or for desktop!

MacPerformanceGuide.com
View all handpicked deals...

Sony WH-1000XM4 Wireless Noise-Canceling Over-Ear Headphones (Black)
$348 $278
SAVE $70

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.